package org.apache.maven.artifact.resolver;

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

import java.util.ArrayList;
import java.util.Collection;
import java.util.List;

import org.codehaus.plexus.component.annotations.Component;

/**
 * @author Benjamin Bentmann
 */
@Component(role = ResolutionErrorHandler.class)
public class DefaultResolutionErrorHandler implements ResolutionErrorHandler {

  public void throwErrors(ArtifactResolutionRequest request, ArtifactResolutionResult result)
      throws ArtifactResolutionException {
    // Metadata cannot be found

    if (result.hasMetadataResolutionExceptions()) {
      throw result.getMetadataResolutionException(0);
    }

    // Metadata cannot be retrieved

    // Cyclic Dependency Error

    if (result.hasCircularDependencyExceptions()) {
      throw result.getCircularDependencyException(0);
    }

    // Version Range Violation

    if (result.hasVersionRangeViolations()) {
      throw result.getVersionRangeViolation(0);
    }

    // Transfer Error

    if (result.hasErrorArtifactExceptions()) {
      throw result.getErrorArtifactExceptions().get(0);
    }

    if (result.hasMissingArtifacts()) {
      throw new MultipleArtifactsNotFoundException(request.getArtifact(), toList(result.getArtifacts()),
          result.getMissingArtifacts(), request.getRemoteRepositories());
    }

    // this should never happen since we checked all possible error sources before but better be
    // sure
    if (result.hasExceptions()) {
      throw new ArtifactResolutionException(
          "Unknown error during artifact resolution, " + request + ", " + result.getExceptions(), request.getArtifact(),
          request.getRemoteRepositories());
    }
  }

  private static <T> List<T> toList(Collection<T> items) {
    return (items != null) ? new ArrayList<T>(items) : null;
  }

}
